Sounds like CPS or MAF sensor. I had issues with my N/A, I took apart the MAF and throttle body, also disconnected the negative on the battery. Cleaned the MAF and throttle body and that solved my issues temporarily while I waited for my 74mm throttle body and new MAF sensor to show up. Also check out the link in my signature, this toy can pull up pending codes that are stored on the ECU but doesn't cause the light to come on. Hope this helps!